May, 2019
www.us-
tech.com
Electronic Materials Improving Automobile Safety, Comfort and Fuel-Efficiency
Continued from previous page
based sensor powerhouse Mobileye, Qualcomm’s purchase of NXP and Samsung’s move to bring U.S.- based auto parts leader Harman into the fold all point to the expanding role of semiconductors in auto electronics — not only for ADAS and vehicle intelligence, but infotainment, drivetrain and vehi- cle connectivity as well. Electronic materials innovation is instru-
mental at the PCB and product assembly level, but also at the semiconductor package level. The small silicon dice — which are the basis for semiconductor devices — must be connected, often to other dice within the same package and then from the package to the substrate. Die con- nection requires specialized attach adhesives, which is a core competency Henkel has main- tained with leading-edge paste and film die attach solutions for well over 30 years. In terms of sheer capability — from the
semiconductor to the PCB to the camera assem- bly and display — the reality is that autonomous driving and the materials to sup- port it exist today, at least insofar as vehicle, sensor, imaging and processing technology is concerned. To date, what is missing from a more holistic and true autonomous driving experi- ence is the infrastructure. Until modern transportation routes are
transformed and international regulatory bod- ies remove roadblocks, adoption and prolifera- tion of driverless vehicles will be limited. That fact has not prevented automotive OEMs from preparing for its eventual existence, however, by installing V2X (vehicle-to-vehicle or vehicle- to-infrastructure) communication processors and sensors today, laying the groundwork for a hands-free, safe, comfortable, and efficient future driving experience.
New Energy Vehicles While ADAS are effectively saving lives and
making driving more enjoyable, high-performance battery technology is contributing to a cleaner
Gasketing (1), thermal interface (2 and 3) and
potting (4) materials play key roles in Li-ion battery module performance and reliability.
consumers but newer, rechargeable and light- weight Li-ion battery cell technology, like that used in the batteries for computers and smart- phones, has given new life to the electric vehicle (EV). Battery packs are becoming increasingly more affordable and lighter with a boost in range and power, allowing today’s electric vehicles to travel over 200 miles on a single charge.
environment and less dependence on fossil fuels. The global drive to reduce carbon dioxide emis- sions combined with consumer demand for lower gasoline consumption has hastened growth in the alternative energy vehicle market, spurring the adoption of hybrid electric vehicles (HEVs). Hybrids remain a popular choice among auto
Accelerated development of Li-ion battery
technology has increased both the power and ener- gy density of the devices to unprecedented levels. For high-voltage Li-ion batteries to work properly, thermal management of the various components is essential. Overheating of any of the parts —partic- ularly those that are flammable, such as the elec- trodes within the battery cells — at a mini- mum could result in a shorter work life and, at worst, a dire safety issue. This demand for reliable thermal control
of new energy vehicle (NEV) battery systems is a main reason why the world’s top automo- tive electronics manufacturers have partnered with leading thermal management innovators like Henkel. Proven, adaptable TIMs — both in liquid
and pad form — help control heat generated by the cells within and produced by the battery module, which has an interface to the battery pack. Robust, capable thermal management solutions optimize the life of the battery, pro- vide insulation for safe in-use functionality and contribute to reliable, road-ready EVs and plugin HEVs.
Not too Hot, Not too Cold Optimizing the operation of Li-ion batter-
ies, however, isn’t simply about thermal con- trol when the vehicle is running. Several Li- ion battery systems are temperature-con-
trolled and must be at a specific temperature range at any given time, which makes starting the car in freezing conditions problematic. Warming the battery to approximately 50°F
(10°C) before use is often required to avoid damage from cell degradation. New printed ink development efforts have
yielded a novel, positive temperature coefficient ink that is self-regulating, meaning that it will not rise above its set temperature. The rapid heating capability of the ink helps warm the battery cells
Continued on page 67
Page 63
See at SMTconnect, Hall 4A Booth 230
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